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<table width="100%" summary="page for CYGOB1"><tr><td>CYGOB1</td><td align="right">R Documentation</td></tr></table>

<h2> CYG OB1 Star Cluster Data </h2>

<h3>Description</h3>


<p>Energy output and surface termperature for Star Cluster CYG OB1.
</p>


<h3>Usage</h3>

<pre>data("CYGOB1")</pre>


<h3>Format</h3>


<p>A data frame with 47 observations on the following 2 variables.
</p>

<dl>
<dt><code>logst</code></dt><dd><p>log survface termperature of the star.</p>
</dd>
<dt><code>logli</code></dt><dd><p>log light intensity of the star.</p>
</dd>
</dl>



<h3>Details</h3>


<p>The Hertzsprung-Russell (H-R) diagram forms the basis of
the theory of stellar evolution. The diagram is essentially a 
plot of the energy output of stars plotted against their surface
temperature. Data from the H-R diagram of Star Cluster CYG OB1, 
calibrated according to VanismaGreve1972 are given here.
</p>


<h3>Source</h3>


<p>F. Vanisma and J. P. De Greve (1972), Close binary systems 
before and after mass transfer. <EM>Astrophysics and Space Science</EM>,
<B>87</B>, 377&ndash;401.
</p>
<p>D. J. Hand, F. Daly, A. D. Lunn, K. J. McConway and E. Ostrowski (1994).
<EM>A Handbook of Small Datasets</EM>, Chapman and Hall/CRC, London.
</p>


<h3>Examples</h3>

<pre>

  data("CYGOB1", package = "HSAUR")
  plot(logst ~ logli, data = CYGOB1)

</pre>


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